src/x11/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dataobj.cpp
   3 // Purpose:     wxDataObject class
   4 // Author:      Julian Smart
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Julian Smart
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11     #pragma implementation "dataobj.h"
  12 #endif
  13
  14 #include "wx/defs.h"
  15
  16 #include "wx/dataobj.h"
  17 #include "wx/mstream.h"
  18 #include "wx/app.h"
  19 #include "wx/image.h"
  20 #include "wx/log.h"
  21
  22 #include "wx/utils.h"
  23 #include "wx/x11/private.h"
  24
  25 //-------------------------------------------------------------------------
  26 // global data
  27 //-------------------------------------------------------------------------
  28
  29 Atom  g_textAtom        = 0;
  30 Atom  g_pngAtom         = 0;
  31 Atom  g_fileAtom        = 0;
  32
  33 //-------------------------------------------------------------------------
  34 // wxDataFormat
  35 //-------------------------------------------------------------------------
  36
  37 wxDataFormat::wxDataFormat()
  38 {
  39     // do *not* call PrepareFormats() from here for 2 reasons:
  40     //
  41     // 1. we will have time to do it later because some other Set function
  42     //    must be called before we really need them
  43     //
  44     // 2. doing so prevents us from declaring global wxDataFormats because
  45     //    calling PrepareFormats (and thus gdk_atom_intern) before GDK is
  46     //    initialised will result in a crash
  47     m_type = wxDF_INVALID;
  48     m_format = (Atom) 0;
  49 }
  50
  51 wxDataFormat::wxDataFormat( wxDataFormatId type )
  52 {
  53     PrepareFormats();
  54     SetType( type );
  55 }
  56
  57 wxDataFormat::wxDataFormat( const wxChar *id )
  58 {
  59     PrepareFormats();
  60     SetId( id );
  61 }
  62
  63 wxDataFormat::wxDataFormat( const wxString &id )
  64 {
  65     PrepareFormats();
  66     SetId( id );
  67 }
  68
  69 wxDataFormat::wxDataFormat( NativeFormat format )
  70 {
  71     PrepareFormats();
  72     SetId( format );
  73 }
  74
  75 void wxDataFormat::SetType( wxDataFormatId type )
  76 {
  77     PrepareFormats();
  78     m_type = type;
  79
  80     if (m_type == wxDF_TEXT)
  81         m_format = g_textAtom;
  82     else
  83     if (m_type == wxDF_BITMAP)
  84         m_format = g_pngAtom;
  85     else
  86     if (m_type == wxDF_FILENAME)
  87         m_format = g_fileAtom;
  88     else
  89     {
  90        wxFAIL_MSG( wxT("invalid dataformat") );
  91     }
  92 }
  93
  94 wxDataFormatId wxDataFormat::GetType() const
  95 {
  96     return m_type;
  97 }
  98
  99 wxString wxDataFormat::GetId() const
 100 {
 101 #if wxUSE_NANOX
 102     return wxEmptyString;
 103 #else
 104     char *t = XGetAtomName ((Display*) wxGetDisplay(), m_format);
 105     wxString ret = wxString::FromAscii( t );
 106     if (t)
 107         XFree( t );
 108     return ret;
 109 #endif
 110 }
 111
 112 void wxDataFormat::SetId( NativeFormat format )
 113 {
 114     PrepareFormats();
 115     m_format = format;
 116
 117     if (m_format == g_textAtom)
 118         m_type = wxDF_TEXT;
 119     else
 120     if (m_format == g_pngAtom)
 121         m_type = wxDF_BITMAP;
 122     else
 123     if (m_format == g_fileAtom)
 124         m_type = wxDF_FILENAME;
 125     else
 126         m_type = wxDF_PRIVATE;
 127 }
 128
 129 void wxDataFormat::SetId( const wxChar *id )
 130 {
 131 #if !wxUSE_NANOX
 132     PrepareFormats();
 133     m_type = wxDF_PRIVATE;
 134     wxString tmp( id );
 135     m_format = XInternAtom( (Display*) wxGetDisplay(), tmp.ToAscii(), FALSE );
 136 #endif
 137 }
 138
 139 void wxDataFormat::PrepareFormats()
 140 {
 141 #if !wxUSE_NANOX
 142     if (!g_textAtom)
 143         g_textAtom = XInternAtom( (Display*) wxGetDisplay(), "STRING", FALSE );
 144     if (!g_pngAtom)
 145         g_pngAtom = XInternAtom( (Display*) wxGetDisplay(), "image/png", FALSE );
 146     if (!g_fileAtom)
 147         g_fileAtom = XInternAtom( (Display*) wxGetDisplay(), "text/uri-list", FALSE );
 148 #endif
 149 }
 150
 151 //-------------------------------------------------------------------------
 152 // wxDataObject
 153 //-------------------------------------------------------------------------
 154
 155 wxDataObject::wxDataObject()
 156 {
 157 }
 158
 159 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 160 {
 161     size_t nFormatCount = GetFormatCount(dir);
 162     if ( nFormatCount == 1 )
 163     {
 164         return format == GetPreferredFormat();
 165     }
 166     else
 167     {
 168         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 169         GetAllFormats(formats,dir);
 170
 171         size_t n;
 172         for ( n = 0; n < nFormatCount; n++ )
 173         {
 174             if ( formats[n] == format )
 175                 break;
 176         }
 177
 178         delete [] formats;
 179
 180         // found?
 181         return n < nFormatCount;
 182     }
 183 }
 184
 185 // ----------------------------------------------------------------------------
 186 // wxFileDataObject
 187 // ----------------------------------------------------------------------------
 188
 189 bool wxFileDataObject::GetDataHere(void *buf) const
 190 {
 191     wxString filenames;
 192
 193     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 194     {
 195         filenames += m_filenames[i];
 196         filenames += (wxChar) 0;
 197     }
 198
 199     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 200
 201     return TRUE;
 202 }
 203
 204 size_t wxFileDataObject::GetDataSize() const
 205 {
 206     size_t res = 0;
 207
 208     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 209     {
 210         res += m_filenames[i].Len();
 211         res += 1;
 212     }
 213
 214     return res + 1;
 215 }
 216
 217 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 218 {
 219     // VZ: old format
 220 #if 0
 221     // filenames are stores as a string with #0 as deliminators
 222     const char *filenames = (const char*) buf;
 223     size_t pos = 0;
 224     for(;;)
 225     {
 226         if (filenames[0] == 0)
 227             break;
 228         if (pos >= size)
 229             break;
 230         wxString file( filenames );  // this returns the first file
 231         AddFile( file );
 232         pos += file.Len()+1;
 233         filenames += file.Len()+1;
 234     }
 235 #else // 1
 236     m_filenames.Empty();
 237
 238     // the text/uri-list format is a sequence of URIs (filenames prefixed by
 239     // "file:" as far as I see) delimited by "\r\n" of total length size
 240     // (I wonder what happens if the file has '\n' in its filename??)
 241     wxString filename;
 242     for ( const char *p = (const char *)buf; ; p++ )
 243     {
 244         // some broken programs (testdnd GTK+ sample!) omit the trailing
 245         // "\r\n", so check for '\0' explicitly here instead of doing it in
 246         // the loop statement to account for it
 247         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 248         {
 249             size_t lenPrefix = 5; // strlen("file:")
 250             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 251             {
 252                 // sometimes the syntax is "file:filename", sometimes it's
 253                 // URL-like: "file://filename" - deal with both
 254                 if ( filename[lenPrefix] == _T('/') &&
 255                      filename[lenPrefix + 1] == _T('/') )
 256                 {
 257                     // skip the slashes
 258                     lenPrefix += 2;
 259                 }
 260
 261                 AddFile(filename.c_str() + lenPrefix);
 262                 filename.Empty();
 263             }
 264             else
 265             {
 266                 wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
 267                            filename.c_str());
 268             }
 269
 270             if ( !*p )
 271                 break;
 272
 273             // skip '\r'
 274             p++;
 275         }
 276         else
 277         {
 278             filename += *p;
 279         }
 280     }
 281 #endif // 0/1
 282
 283     return TRUE;
 284 }
 285
 286 void wxFileDataObject::AddFile( const wxString &filename )
 287 {
 288    m_filenames.Add( filename );
 289 }
 290
 291 // ----------------------------------------------------------------------------
 292 // wxBitmapDataObject
 293 // ----------------------------------------------------------------------------
 294
 295 wxBitmapDataObject::wxBitmapDataObject()
 296 {
 297     Init();
 298 }
 299
 300 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 301                   : wxBitmapDataObjectBase(bitmap)
 302 {
 303     Init();
 304
 305     DoConvertToPng();
 306 }
 307
 308 wxBitmapDataObject::~wxBitmapDataObject()
 309 {
 310     Clear();
 311 }
 312
 313 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 314 {
 315     ClearAll();
 316
 317     wxBitmapDataObjectBase::SetBitmap(bitmap);
 318
 319     DoConvertToPng();
 320 }
 321
 322 bool wxBitmapDataObject::GetDataHere(void *buf) const
 323 {
 324     if ( !m_pngSize )
 325     {
 326         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 327
 328         return FALSE;
 329     }
 330
 331     memcpy(buf, m_pngData, m_pngSize);
 332
 333     return TRUE;
 334 }
 335
 336 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 337 {
 338     Clear();
 339
 340 #if wxUSE_LIBPNG
 341     m_pngSize = size;
 342     m_pngData = malloc(m_pngSize);
 343
 344     memcpy( m_pngData, buf, m_pngSize );
 345
 346     wxMemoryInputStream mstream( (char*) m_pngData, m_pngSize );
 347     wxImage image;
 348     wxPNGHandler handler;
 349     if ( !handler.LoadFile( &image, mstream ) )
 350     {
 351         return FALSE;
 352     }
 353
 354     m_bitmap = image;
 355
 356     return m_bitmap.Ok();
 357 #else
 358     return FALSE;
 359 #endif
 360 }
 361
 362 void wxBitmapDataObject::DoConvertToPng()
 363 {
 364 #if wxUSE_LIBPNG
 365     if (!m_bitmap.Ok())
 366         return;
 367
 368     wxImage image = m_bitmap.ConvertToImage();
 369     wxPNGHandler handler;
 370
 371     wxCountingOutputStream count;
 372     handler.SaveFile( &image, count );
 373
 374     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 375     m_pngData = malloc(m_pngSize);
 376
 377     wxMemoryOutputStream mstream( (char*) m_pngData, m_pngSize );
 378     handler.SaveFile( &image, mstream );
 379 #endif
 380 }
 381